16e790746SPaolo Bonzini /* 26e790746SPaolo Bonzini * Virtio Block Device 36e790746SPaolo Bonzini * 46e790746SPaolo Bonzini * Copyright IBM, Corp. 2007 56e790746SPaolo Bonzini * 66e790746SPaolo Bonzini * Authors: 76e790746SPaolo Bonzini * Anthony Liguori <aliguori@us.ibm.com> 86e790746SPaolo Bonzini * 96e790746SPaolo Bonzini * This work is licensed under the terms of the GNU GPL, version 2. See 106e790746SPaolo Bonzini * the COPYING file in the top-level directory. 116e790746SPaolo Bonzini * 126e790746SPaolo Bonzini */ 136e790746SPaolo Bonzini 1480c71a24SPeter Maydell #include "qemu/osdep.h" 15da34e65cSMarkus Armbruster #include "qapi/error.h" 166e790746SPaolo Bonzini #include "qemu-common.h" 17827805a2SFam Zheng #include "qemu/iov.h" 186e790746SPaolo Bonzini #include "qemu/error-report.h" 196e790746SPaolo Bonzini #include "trace.h" 206e790746SPaolo Bonzini #include "hw/block/block.h" 216e790746SPaolo Bonzini #include "sysemu/blockdev.h" 226e790746SPaolo Bonzini #include "hw/virtio/virtio-blk.h" 236e790746SPaolo Bonzini #include "dataplane/virtio-blk.h" 2408e2c9f1SPaolo Bonzini #include "scsi/constants.h" 256e790746SPaolo Bonzini #ifdef __linux__ 266e790746SPaolo Bonzini # include <scsi/sg.h> 276e790746SPaolo Bonzini #endif 286e790746SPaolo Bonzini #include "hw/virtio/virtio-bus.h" 29783d1897SRusty Russell #include "hw/virtio/virtio-access.h" 306e790746SPaolo Bonzini 31d14dde5eSGreg Kurz static void virtio_blk_init_request(VirtIOBlock *s, VirtQueue *vq, 32edaffd9fSStefan Hajnoczi VirtIOBlockReq *req) 33671ec3f0SFam Zheng { 34671ec3f0SFam Zheng req->dev = s; 35edaffd9fSStefan Hajnoczi req->vq = vq; 36869d66afSStefan Hajnoczi req->qiov.size = 0; 372a6cdd6dSPaolo Bonzini req->in_len = 0; 38869d66afSStefan Hajnoczi req->next = NULL; 3995f7142aSPeter Lieven req->mr_next = NULL; 40671ec3f0SFam Zheng } 41671ec3f0SFam Zheng 42d14dde5eSGreg Kurz static void virtio_blk_free_request(VirtIOBlockReq *req) 43671ec3f0SFam Zheng { 44c84b3192SPaolo Bonzini g_free(req); 45671ec3f0SFam Zheng } 46671ec3f0SFam Zheng 4703de2f52SPaolo Bonzini static void virtio_blk_req_complete(VirtIOBlockReq *req, unsigned char status) 486e790746SPaolo Bonzini { 496e790746SPaolo Bonzini VirtIOBlock *s = req->dev; 506e790746SPaolo Bonzini VirtIODevice *vdev = VIRTIO_DEVICE(s); 516e790746SPaolo Bonzini 52a576ceacSStefan Hajnoczi trace_virtio_blk_req_complete(vdev, req, status); 536e790746SPaolo Bonzini 546e790746SPaolo Bonzini stb_p(&req->in->status, status); 55edaffd9fSStefan Hajnoczi virtqueue_push(req->vq, &req->elem, req->in_len); 56eb41cf78SPaolo Bonzini if (s->dataplane_started && !s->dataplane_disabled) { 57edaffd9fSStefan Hajnoczi virtio_blk_data_plane_notify(s->dataplane, req->vq); 5803de2f52SPaolo Bonzini } else { 59edaffd9fSStefan Hajnoczi virtio_notify(vdev, req->vq); 606e790746SPaolo Bonzini } 61bf4bd461SFam Zheng } 62bf4bd461SFam Zheng 636e790746SPaolo Bonzini static int virtio_blk_handle_rw_error(VirtIOBlockReq *req, int error, 646e790746SPaolo Bonzini bool is_read) 656e790746SPaolo Bonzini { 666e790746SPaolo Bonzini VirtIOBlock *s = req->dev; 67*9a6719d5SStefano Garzarella BlockErrorAction action = blk_get_error_action(s->blk, is_read, error); 686e790746SPaolo Bonzini 69a589569fSWenchao Xia if (action == BLOCK_ERROR_ACTION_STOP) { 70466138dcSFam Zheng /* Break the link as the next request is going to be parsed from the 71466138dcSFam Zheng * ring again. Otherwise we may end up doing a double completion! */ 72466138dcSFam Zheng req->mr_next = NULL; 736e790746SPaolo Bonzini req->next = s->rq; 746e790746SPaolo Bonzini s->rq = req; 75a589569fSWenchao Xia } else if (action == BLOCK_ERROR_ACTION_REPORT) { 766e790746SPaolo Bonzini virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR); 7701762e03SAlberto Garcia block_acct_failed(blk_get_stats(s->blk), &req->acct); 78671ec3f0SFam Zheng virtio_blk_free_request(req); 796e790746SPaolo Bonzini } 806e790746SPaolo Bonzini 814be74634SMarkus Armbruster blk_error_action(s->blk, action, is_read, error); 82a589569fSWenchao Xia return action != BLOCK_ERROR_ACTION_IGNORE; 836e790746SPaolo Bonzini } 846e790746SPaolo Bonzini 856e790746SPaolo Bonzini static void virtio_blk_rw_complete(void *opaque, int ret) 866e790746SPaolo Bonzini { 8795f7142aSPeter Lieven VirtIOBlockReq *next = opaque; 88b9e413ddSPaolo Bonzini VirtIOBlock *s = next->dev; 89a576ceacSStefan Hajnoczi VirtIODevice *vdev = VIRTIO_DEVICE(s); 906e790746SPaolo Bonzini 91b9e413ddSPaolo Bonzini aio_context_acquire(blk_get_aio_context(s->conf.conf.blk)); 9295f7142aSPeter Lieven while (next) { 9395f7142aSPeter Lieven VirtIOBlockReq *req = next; 9495f7142aSPeter Lieven next = req->mr_next; 95a576ceacSStefan Hajnoczi trace_virtio_blk_rw_complete(vdev, req, ret); 966e790746SPaolo Bonzini 9795f7142aSPeter Lieven if (req->qiov.nalloc != -1) { 98e61809edSDongli Zhang /* If nalloc is != -1 req->qiov is a local copy of the original 999bb192a4SYaowei Bai * external iovec. It was allocated in submit_requests to be 1009bb192a4SYaowei Bai * able to merge requests. */ 10195f7142aSPeter Lieven qemu_iovec_destroy(&req->qiov); 10295f7142aSPeter Lieven } 10395f7142aSPeter Lieven 1046e790746SPaolo Bonzini if (ret) { 105783d1897SRusty Russell int p = virtio_ldl_p(VIRTIO_DEVICE(req->dev), &req->out.type); 106783d1897SRusty Russell bool is_read = !(p & VIRTIO_BLK_T_OUT); 1072a6cdd6dSPaolo Bonzini /* Note that memory may be dirtied on read failure. If the 1082a6cdd6dSPaolo Bonzini * virtio request is not completed here, as is the case for 1092a6cdd6dSPaolo Bonzini * BLOCK_ERROR_ACTION_STOP, the memory may not be copied 1102a6cdd6dSPaolo Bonzini * correctly during live migration. While this is ugly, 1112a6cdd6dSPaolo Bonzini * it is acceptable because the device is free to write to 1122a6cdd6dSPaolo Bonzini * the memory until the request is completed (which will 1132a6cdd6dSPaolo Bonzini * happen on the other side of the migration). 1142a6cdd6dSPaolo Bonzini */ 11595f7142aSPeter Lieven if (virtio_blk_handle_rw_error(req, -ret, is_read)) { 11695f7142aSPeter Lieven continue; 11795f7142aSPeter Lieven } 1186e790746SPaolo Bonzini } 1196e790746SPaolo Bonzini 1206e790746SPaolo Bonzini virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); 1214be74634SMarkus Armbruster block_acct_done(blk_get_stats(req->dev->blk), &req->acct); 122671ec3f0SFam Zheng virtio_blk_free_request(req); 1236e790746SPaolo Bonzini } 124b9e413ddSPaolo Bonzini aio_context_release(blk_get_aio_context(s->conf.conf.blk)); 12595f7142aSPeter Lieven } 1266e790746SPaolo Bonzini 1276e790746SPaolo Bonzini static void virtio_blk_flush_complete(void *opaque, int ret) 1286e790746SPaolo Bonzini { 1296e790746SPaolo Bonzini VirtIOBlockReq *req = opaque; 130b9e413ddSPaolo Bonzini VirtIOBlock *s = req->dev; 1316e790746SPaolo Bonzini 132b9e413ddSPaolo Bonzini aio_context_acquire(blk_get_aio_context(s->conf.conf.blk)); 1336e790746SPaolo Bonzini if (ret) { 1346e790746SPaolo Bonzini if (virtio_blk_handle_rw_error(req, -ret, 0)) { 135b9e413ddSPaolo Bonzini goto out; 1366e790746SPaolo Bonzini } 1376e790746SPaolo Bonzini } 1386e790746SPaolo Bonzini 1396e790746SPaolo Bonzini virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); 140*9a6719d5SStefano Garzarella block_acct_done(blk_get_stats(s->blk), &req->acct); 141671ec3f0SFam Zheng virtio_blk_free_request(req); 142b9e413ddSPaolo Bonzini 143b9e413ddSPaolo Bonzini out: 144b9e413ddSPaolo Bonzini aio_context_release(blk_get_aio_context(s->conf.conf.blk)); 1456e790746SPaolo Bonzini } 1466e790746SPaolo Bonzini 1471dc936aaSFam Zheng #ifdef __linux__ 1481dc936aaSFam Zheng 1491dc936aaSFam Zheng typedef struct { 1501dc936aaSFam Zheng VirtIOBlockReq *req; 1511dc936aaSFam Zheng struct sg_io_hdr hdr; 1521dc936aaSFam Zheng } VirtIOBlockIoctlReq; 1531dc936aaSFam Zheng 1541dc936aaSFam Zheng static void virtio_blk_ioctl_complete(void *opaque, int status) 1551dc936aaSFam Zheng { 1561dc936aaSFam Zheng VirtIOBlockIoctlReq *ioctl_req = opaque; 1571dc936aaSFam Zheng VirtIOBlockReq *req = ioctl_req->req; 1589d456654SPaolo Bonzini VirtIOBlock *s = req->dev; 1599d456654SPaolo Bonzini VirtIODevice *vdev = VIRTIO_DEVICE(s); 1601dc936aaSFam Zheng struct virtio_scsi_inhdr *scsi; 1611dc936aaSFam Zheng struct sg_io_hdr *hdr; 1621dc936aaSFam Zheng 1631dc936aaSFam Zheng scsi = (void *)req->elem.in_sg[req->elem.in_num - 2].iov_base; 1641dc936aaSFam Zheng 1651dc936aaSFam Zheng if (status) { 1661dc936aaSFam Zheng status = VIRTIO_BLK_S_UNSUPP; 1671dc936aaSFam Zheng virtio_stl_p(vdev, &scsi->errors, 255); 1681dc936aaSFam Zheng goto out; 1691dc936aaSFam Zheng } 1701dc936aaSFam Zheng 1711dc936aaSFam Zheng hdr = &ioctl_req->hdr; 1721dc936aaSFam Zheng /* 1731dc936aaSFam Zheng * From SCSI-Generic-HOWTO: "Some lower level drivers (e.g. ide-scsi) 1741dc936aaSFam Zheng * clear the masked_status field [hence status gets cleared too, see 1751dc936aaSFam Zheng * block/scsi_ioctl.c] even when a CHECK_CONDITION or COMMAND_TERMINATED 1761dc936aaSFam Zheng * status has occurred. However they do set DRIVER_SENSE in driver_status 1771dc936aaSFam Zheng * field. Also a (sb_len_wr > 0) indicates there is a sense buffer. 1781dc936aaSFam Zheng */ 1791dc936aaSFam Zheng if (hdr->status == 0 && hdr->sb_len_wr > 0) { 1801dc936aaSFam Zheng hdr->status = CHECK_CONDITION; 1811dc936aaSFam Zheng } 1821dc936aaSFam Zheng 1831dc936aaSFam Zheng virtio_stl_p(vdev, &scsi->errors, 1841dc936aaSFam Zheng hdr->status | (hdr->msg_status << 8) | 1851dc936aaSFam Zheng (hdr->host_status << 16) | (hdr->driver_status << 24)); 1861dc936aaSFam Zheng virtio_stl_p(vdev, &scsi->residual, hdr->resid); 1871dc936aaSFam Zheng virtio_stl_p(vdev, &scsi->sense_len, hdr->sb_len_wr); 1881dc936aaSFam Zheng virtio_stl_p(vdev, &scsi->data_len, hdr->dxfer_len); 1891dc936aaSFam Zheng 1901dc936aaSFam Zheng out: 191b9e413ddSPaolo Bonzini aio_context_acquire(blk_get_aio_context(s->conf.conf.blk)); 1921dc936aaSFam Zheng virtio_blk_req_complete(req, status); 1931dc936aaSFam Zheng virtio_blk_free_request(req); 194b9e413ddSPaolo Bonzini aio_context_release(blk_get_aio_context(s->conf.conf.blk)); 1951dc936aaSFam Zheng g_free(ioctl_req); 1961dc936aaSFam Zheng } 1971dc936aaSFam Zheng 1981dc936aaSFam Zheng #endif 1991dc936aaSFam Zheng 200edaffd9fSStefan Hajnoczi static VirtIOBlockReq *virtio_blk_get_request(VirtIOBlock *s, VirtQueue *vq) 2016e790746SPaolo Bonzini { 202edaffd9fSStefan Hajnoczi VirtIOBlockReq *req = virtqueue_pop(vq, sizeof(VirtIOBlockReq)); 2036e790746SPaolo Bonzini 20451b19ebeSPaolo Bonzini if (req) { 205edaffd9fSStefan Hajnoczi virtio_blk_init_request(s, vq, req); 2066e790746SPaolo Bonzini } 2076e790746SPaolo Bonzini return req; 2086e790746SPaolo Bonzini } 2096e790746SPaolo Bonzini 21075344fa4SFam Zheng static int virtio_blk_handle_scsi_req(VirtIOBlockReq *req) 2116e790746SPaolo Bonzini { 2126e790746SPaolo Bonzini int status = VIRTIO_BLK_S_OK; 2135a05cbeeSFam Zheng struct virtio_scsi_inhdr *scsi = NULL; 21475344fa4SFam Zheng VirtIODevice *vdev = VIRTIO_DEVICE(req->dev); 21575344fa4SFam Zheng VirtQueueElement *elem = &req->elem; 21675344fa4SFam Zheng VirtIOBlock *blk = req->dev; 217783d1897SRusty Russell 2185a05cbeeSFam Zheng #ifdef __linux__ 2195a05cbeeSFam Zheng int i; 2201dc936aaSFam Zheng VirtIOBlockIoctlReq *ioctl_req; 221a209f461SFam Zheng BlockAIOCB *acb; 2225a05cbeeSFam Zheng #endif 2236e790746SPaolo Bonzini 2246e790746SPaolo Bonzini /* 2256e790746SPaolo Bonzini * We require at least one output segment each for the virtio_blk_outhdr 2266e790746SPaolo Bonzini * and the SCSI command block. 2276e790746SPaolo Bonzini * 2286e790746SPaolo Bonzini * We also at least require the virtio_blk_inhdr, the virtio_scsi_inhdr 2296e790746SPaolo Bonzini * and the sense buffer pointer in the input segments. 2306e790746SPaolo Bonzini */ 2315a05cbeeSFam Zheng if (elem->out_num < 2 || elem->in_num < 3) { 2325a05cbeeSFam Zheng status = VIRTIO_BLK_S_IOERR; 2335a05cbeeSFam Zheng goto fail; 2346e790746SPaolo Bonzini } 2356e790746SPaolo Bonzini 2366e790746SPaolo Bonzini /* 2376e790746SPaolo Bonzini * The scsi inhdr is placed in the second-to-last input segment, just 2386e790746SPaolo Bonzini * before the regular inhdr. 2396e790746SPaolo Bonzini */ 2405a05cbeeSFam Zheng scsi = (void *)elem->in_sg[elem->in_num - 2].iov_base; 2416e790746SPaolo Bonzini 2422a30307fSMarkus Armbruster if (!blk->conf.scsi) { 2436e790746SPaolo Bonzini status = VIRTIO_BLK_S_UNSUPP; 2446e790746SPaolo Bonzini goto fail; 2456e790746SPaolo Bonzini } 2466e790746SPaolo Bonzini 2476e790746SPaolo Bonzini /* 2486e790746SPaolo Bonzini * No support for bidirection commands yet. 2496e790746SPaolo Bonzini */ 2505a05cbeeSFam Zheng if (elem->out_num > 2 && elem->in_num > 3) { 2516e790746SPaolo Bonzini status = VIRTIO_BLK_S_UNSUPP; 2526e790746SPaolo Bonzini goto fail; 2536e790746SPaolo Bonzini } 2546e790746SPaolo Bonzini 2556e790746SPaolo Bonzini #ifdef __linux__ 2561dc936aaSFam Zheng ioctl_req = g_new0(VirtIOBlockIoctlReq, 1); 2571dc936aaSFam Zheng ioctl_req->req = req; 2581dc936aaSFam Zheng ioctl_req->hdr.interface_id = 'S'; 2591dc936aaSFam Zheng ioctl_req->hdr.cmd_len = elem->out_sg[1].iov_len; 2601dc936aaSFam Zheng ioctl_req->hdr.cmdp = elem->out_sg[1].iov_base; 2611dc936aaSFam Zheng ioctl_req->hdr.dxfer_len = 0; 2626e790746SPaolo Bonzini 2635a05cbeeSFam Zheng if (elem->out_num > 2) { 2646e790746SPaolo Bonzini /* 2656e790746SPaolo Bonzini * If there are more than the minimally required 2 output segments 2666e790746SPaolo Bonzini * there is write payload starting from the third iovec. 2676e790746SPaolo Bonzini */ 2681dc936aaSFam Zheng ioctl_req->hdr.dxfer_direction = SG_DXFER_TO_DEV; 2691dc936aaSFam Zheng ioctl_req->hdr.iovec_count = elem->out_num - 2; 2706e790746SPaolo Bonzini 2711dc936aaSFam Zheng for (i = 0; i < ioctl_req->hdr.iovec_count; i++) { 2721dc936aaSFam Zheng ioctl_req->hdr.dxfer_len += elem->out_sg[i + 2].iov_len; 2731dc936aaSFam Zheng } 2746e790746SPaolo Bonzini 2751dc936aaSFam Zheng ioctl_req->hdr.dxferp = elem->out_sg + 2; 2766e790746SPaolo Bonzini 2775a05cbeeSFam Zheng } else if (elem->in_num > 3) { 2786e790746SPaolo Bonzini /* 2796e790746SPaolo Bonzini * If we have more than 3 input segments the guest wants to actually 2806e790746SPaolo Bonzini * read data. 2816e790746SPaolo Bonzini */ 2821dc936aaSFam Zheng ioctl_req->hdr.dxfer_direction = SG_DXFER_FROM_DEV; 2831dc936aaSFam Zheng ioctl_req->hdr.iovec_count = elem->in_num - 3; 2841dc936aaSFam Zheng for (i = 0; i < ioctl_req->hdr.iovec_count; i++) { 2851dc936aaSFam Zheng ioctl_req->hdr.dxfer_len += elem->in_sg[i].iov_len; 2861dc936aaSFam Zheng } 2876e790746SPaolo Bonzini 2881dc936aaSFam Zheng ioctl_req->hdr.dxferp = elem->in_sg; 2896e790746SPaolo Bonzini } else { 2906e790746SPaolo Bonzini /* 2916e790746SPaolo Bonzini * Some SCSI commands don't actually transfer any data. 2926e790746SPaolo Bonzini */ 2931dc936aaSFam Zheng ioctl_req->hdr.dxfer_direction = SG_DXFER_NONE; 2946e790746SPaolo Bonzini } 2956e790746SPaolo Bonzini 2961dc936aaSFam Zheng ioctl_req->hdr.sbp = elem->in_sg[elem->in_num - 3].iov_base; 2971dc936aaSFam Zheng ioctl_req->hdr.mx_sb_len = elem->in_sg[elem->in_num - 3].iov_len; 2986e790746SPaolo Bonzini 299a209f461SFam Zheng acb = blk_aio_ioctl(blk->blk, SG_IO, &ioctl_req->hdr, 3001dc936aaSFam Zheng virtio_blk_ioctl_complete, ioctl_req); 301a209f461SFam Zheng if (!acb) { 302a209f461SFam Zheng g_free(ioctl_req); 303a209f461SFam Zheng status = VIRTIO_BLK_S_UNSUPP; 304a209f461SFam Zheng goto fail; 305a209f461SFam Zheng } 3061dc936aaSFam Zheng return -EINPROGRESS; 3076e790746SPaolo Bonzini #else 3086e790746SPaolo Bonzini abort(); 3096e790746SPaolo Bonzini #endif 3106e790746SPaolo Bonzini 3116e790746SPaolo Bonzini fail: 3126e790746SPaolo Bonzini /* Just put anything nonzero so that the ioctl fails in the guest. */ 3135a05cbeeSFam Zheng if (scsi) { 314783d1897SRusty Russell virtio_stl_p(vdev, &scsi->errors, 255); 3155a05cbeeSFam Zheng } 3165a05cbeeSFam Zheng return status; 3175a05cbeeSFam Zheng } 3185a05cbeeSFam Zheng 3195a05cbeeSFam Zheng static void virtio_blk_handle_scsi(VirtIOBlockReq *req) 3205a05cbeeSFam Zheng { 3215a05cbeeSFam Zheng int status; 3225a05cbeeSFam Zheng 32375344fa4SFam Zheng status = virtio_blk_handle_scsi_req(req); 3241dc936aaSFam Zheng if (status != -EINPROGRESS) { 3256e790746SPaolo Bonzini virtio_blk_req_complete(req, status); 326671ec3f0SFam Zheng virtio_blk_free_request(req); 3276e790746SPaolo Bonzini } 3281dc936aaSFam Zheng } 3296e790746SPaolo Bonzini 33095f7142aSPeter Lieven static inline void submit_requests(BlockBackend *blk, MultiReqBuffer *mrb, 33195f7142aSPeter Lieven int start, int num_reqs, int niov) 3326e790746SPaolo Bonzini { 33395f7142aSPeter Lieven QEMUIOVector *qiov = &mrb->reqs[start]->qiov; 33495f7142aSPeter Lieven int64_t sector_num = mrb->reqs[start]->sector_num; 33595f7142aSPeter Lieven bool is_write = mrb->is_write; 3366e790746SPaolo Bonzini 33795f7142aSPeter Lieven if (num_reqs > 1) { 33895f7142aSPeter Lieven int i; 33995f7142aSPeter Lieven struct iovec *tmp_iov = qiov->iov; 34095f7142aSPeter Lieven int tmp_niov = qiov->niov; 34195f7142aSPeter Lieven 34295f7142aSPeter Lieven /* mrb->reqs[start]->qiov was initialized from external so we can't 343b5772fddSEric Blake * modify it here. We need to initialize it locally and then add the 34495f7142aSPeter Lieven * external iovecs. */ 34595f7142aSPeter Lieven qemu_iovec_init(qiov, niov); 34695f7142aSPeter Lieven 34795f7142aSPeter Lieven for (i = 0; i < tmp_niov; i++) { 34895f7142aSPeter Lieven qemu_iovec_add(qiov, tmp_iov[i].iov_base, tmp_iov[i].iov_len); 34995f7142aSPeter Lieven } 35095f7142aSPeter Lieven 35195f7142aSPeter Lieven for (i = start + 1; i < start + num_reqs; i++) { 35295f7142aSPeter Lieven qemu_iovec_concat(qiov, &mrb->reqs[i]->qiov, 0, 35395f7142aSPeter Lieven mrb->reqs[i]->qiov.size); 35495f7142aSPeter Lieven mrb->reqs[i - 1]->mr_next = mrb->reqs[i]; 35595f7142aSPeter Lieven } 35695f7142aSPeter Lieven 357a576ceacSStefan Hajnoczi trace_virtio_blk_submit_multireq(VIRTIO_DEVICE(mrb->reqs[start]->dev), 358a576ceacSStefan Hajnoczi mrb, start, num_reqs, 359b5772fddSEric Blake sector_num << BDRV_SECTOR_BITS, 360b5772fddSEric Blake qiov->size, is_write); 36195f7142aSPeter Lieven block_acct_merge_done(blk_get_stats(blk), 36295f7142aSPeter Lieven is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ, 36395f7142aSPeter Lieven num_reqs - 1); 36495f7142aSPeter Lieven } 36595f7142aSPeter Lieven 36695f7142aSPeter Lieven if (is_write) { 367b5772fddSEric Blake blk_aio_pwritev(blk, sector_num << BDRV_SECTOR_BITS, qiov, 0, 36895f7142aSPeter Lieven virtio_blk_rw_complete, mrb->reqs[start]); 36995f7142aSPeter Lieven } else { 370b5772fddSEric Blake blk_aio_preadv(blk, sector_num << BDRV_SECTOR_BITS, qiov, 0, 37195f7142aSPeter Lieven virtio_blk_rw_complete, mrb->reqs[start]); 37295f7142aSPeter Lieven } 37395f7142aSPeter Lieven } 37495f7142aSPeter Lieven 37595f7142aSPeter Lieven static int multireq_compare(const void *a, const void *b) 37695f7142aSPeter Lieven { 37795f7142aSPeter Lieven const VirtIOBlockReq *req1 = *(VirtIOBlockReq **)a, 37895f7142aSPeter Lieven *req2 = *(VirtIOBlockReq **)b; 37995f7142aSPeter Lieven 38095f7142aSPeter Lieven /* 38195f7142aSPeter Lieven * Note that we can't simply subtract sector_num1 from sector_num2 38295f7142aSPeter Lieven * here as that could overflow the return value. 38395f7142aSPeter Lieven */ 38495f7142aSPeter Lieven if (req1->sector_num > req2->sector_num) { 38595f7142aSPeter Lieven return 1; 38695f7142aSPeter Lieven } else if (req1->sector_num < req2->sector_num) { 38795f7142aSPeter Lieven return -1; 38895f7142aSPeter Lieven } else { 38995f7142aSPeter Lieven return 0; 39095f7142aSPeter Lieven } 39195f7142aSPeter Lieven } 39295f7142aSPeter Lieven 393d14dde5eSGreg Kurz static void virtio_blk_submit_multireq(BlockBackend *blk, MultiReqBuffer *mrb) 39495f7142aSPeter Lieven { 39595f7142aSPeter Lieven int i = 0, start = 0, num_reqs = 0, niov = 0, nb_sectors = 0; 3965def6b80SEric Blake uint32_t max_transfer; 39795f7142aSPeter Lieven int64_t sector_num = 0; 39895f7142aSPeter Lieven 39995f7142aSPeter Lieven if (mrb->num_reqs == 1) { 40095f7142aSPeter Lieven submit_requests(blk, mrb, 0, 1, -1); 40195f7142aSPeter Lieven mrb->num_reqs = 0; 4026e790746SPaolo Bonzini return; 4036e790746SPaolo Bonzini } 4046e790746SPaolo Bonzini 4055def6b80SEric Blake max_transfer = blk_get_max_transfer(mrb->reqs[0]->dev->blk); 40695f7142aSPeter Lieven 40795f7142aSPeter Lieven qsort(mrb->reqs, mrb->num_reqs, sizeof(*mrb->reqs), 40895f7142aSPeter Lieven &multireq_compare); 40995f7142aSPeter Lieven 41095f7142aSPeter Lieven for (i = 0; i < mrb->num_reqs; i++) { 41195f7142aSPeter Lieven VirtIOBlockReq *req = mrb->reqs[i]; 41295f7142aSPeter Lieven if (num_reqs > 0) { 41349cffbc6SGonglei /* 41449cffbc6SGonglei * NOTE: We cannot merge the requests in below situations: 41549cffbc6SGonglei * 1. requests are not sequential 41649cffbc6SGonglei * 2. merge would exceed maximum number of IOVs 41749cffbc6SGonglei * 3. merge would exceed maximum transfer length of backend device 41849cffbc6SGonglei */ 41949cffbc6SGonglei if (sector_num + nb_sectors != req->sector_num || 420222565f6SStefan Hajnoczi niov > blk_get_max_iov(blk) - req->qiov.niov || 4215def6b80SEric Blake req->qiov.size > max_transfer || 4225def6b80SEric Blake nb_sectors > (max_transfer - 4235def6b80SEric Blake req->qiov.size) / BDRV_SECTOR_SIZE) { 42495f7142aSPeter Lieven submit_requests(blk, mrb, start, num_reqs, niov); 42595f7142aSPeter Lieven num_reqs = 0; 4266e790746SPaolo Bonzini } 4276e790746SPaolo Bonzini } 4286e790746SPaolo Bonzini 42995f7142aSPeter Lieven if (num_reqs == 0) { 43095f7142aSPeter Lieven sector_num = req->sector_num; 43195f7142aSPeter Lieven nb_sectors = niov = 0; 43295f7142aSPeter Lieven start = i; 43395f7142aSPeter Lieven } 43495f7142aSPeter Lieven 43595f7142aSPeter Lieven nb_sectors += req->qiov.size / BDRV_SECTOR_SIZE; 43695f7142aSPeter Lieven niov += req->qiov.niov; 43795f7142aSPeter Lieven num_reqs++; 43895f7142aSPeter Lieven } 43995f7142aSPeter Lieven 44095f7142aSPeter Lieven submit_requests(blk, mrb, start, num_reqs, niov); 44195f7142aSPeter Lieven mrb->num_reqs = 0; 4426e790746SPaolo Bonzini } 4436e790746SPaolo Bonzini 4446e790746SPaolo Bonzini static void virtio_blk_handle_flush(VirtIOBlockReq *req, MultiReqBuffer *mrb) 4456e790746SPaolo Bonzini { 4464be74634SMarkus Armbruster block_acct_start(blk_get_stats(req->dev->blk), &req->acct, 0, 4475366d0c8SBenoît Canet BLOCK_ACCT_FLUSH); 4486e790746SPaolo Bonzini 4496e790746SPaolo Bonzini /* 4506e790746SPaolo Bonzini * Make sure all outstanding writes are posted to the backing device. 4516e790746SPaolo Bonzini */ 45295f7142aSPeter Lieven if (mrb->is_write && mrb->num_reqs > 0) { 45395f7142aSPeter Lieven virtio_blk_submit_multireq(req->dev->blk, mrb); 45495f7142aSPeter Lieven } 4554be74634SMarkus Armbruster blk_aio_flush(req->dev->blk, virtio_blk_flush_complete, req); 4566e790746SPaolo Bonzini } 4576e790746SPaolo Bonzini 458d0e14376SMarkus Armbruster static bool virtio_blk_sect_range_ok(VirtIOBlock *dev, 459d0e14376SMarkus Armbruster uint64_t sector, size_t size) 460d0e14376SMarkus Armbruster { 4613c2daac0SMarkus Armbruster uint64_t nb_sectors = size >> BDRV_SECTOR_BITS; 4623c2daac0SMarkus Armbruster uint64_t total_sectors; 4633c2daac0SMarkus Armbruster 46475af1f34SPeter Lieven if (nb_sectors > BDRV_REQUEST_MAX_SECTORS) { 46595f7142aSPeter Lieven return false; 46695f7142aSPeter Lieven } 467d0e14376SMarkus Armbruster if (sector & dev->sector_mask) { 468d0e14376SMarkus Armbruster return false; 469d0e14376SMarkus Armbruster } 4702a30307fSMarkus Armbruster if (size % dev->conf.conf.logical_block_size) { 471d0e14376SMarkus Armbruster return false; 472d0e14376SMarkus Armbruster } 4734be74634SMarkus Armbruster blk_get_geometry(dev->blk, &total_sectors); 4743c2daac0SMarkus Armbruster if (sector > total_sectors || nb_sectors > total_sectors - sector) { 4753c2daac0SMarkus Armbruster return false; 4763c2daac0SMarkus Armbruster } 477d0e14376SMarkus Armbruster return true; 478d0e14376SMarkus Armbruster } 479d0e14376SMarkus Armbruster 48020ea686aSGreg Kurz static int virtio_blk_handle_request(VirtIOBlockReq *req, MultiReqBuffer *mrb) 4816e790746SPaolo Bonzini { 4826e790746SPaolo Bonzini uint32_t type; 483f897bf75SStefan Hajnoczi struct iovec *in_iov = req->elem.in_sg; 4845636da76SDongli Zhang struct iovec *out_iov = req->elem.out_sg; 485f897bf75SStefan Hajnoczi unsigned in_num = req->elem.in_num; 486f897bf75SStefan Hajnoczi unsigned out_num = req->elem.out_num; 48720ea686aSGreg Kurz VirtIOBlock *s = req->dev; 48820ea686aSGreg Kurz VirtIODevice *vdev = VIRTIO_DEVICE(s); 4896e790746SPaolo Bonzini 490f897bf75SStefan Hajnoczi if (req->elem.out_num < 1 || req->elem.in_num < 1) { 49120ea686aSGreg Kurz virtio_error(vdev, "virtio-blk missing headers"); 49220ea686aSGreg Kurz return -1; 4936e790746SPaolo Bonzini } 4946e790746SPaolo Bonzini 4955636da76SDongli Zhang if (unlikely(iov_to_buf(out_iov, out_num, 0, &req->out, 496827805a2SFam Zheng sizeof(req->out)) != sizeof(req->out))) { 49720ea686aSGreg Kurz virtio_error(vdev, "virtio-blk request outhdr too short"); 49820ea686aSGreg Kurz return -1; 499827805a2SFam Zheng } 500ee17e848SFam Zheng 5015636da76SDongli Zhang iov_discard_front(&out_iov, &out_num, sizeof(req->out)); 502ee17e848SFam Zheng 50312048545SGonglei if (in_iov[in_num - 1].iov_len < sizeof(struct virtio_blk_inhdr)) { 50420ea686aSGreg Kurz virtio_error(vdev, "virtio-blk request inhdr too short"); 50520ea686aSGreg Kurz return -1; 506ee17e848SFam Zheng } 507ee17e848SFam Zheng 5082a6cdd6dSPaolo Bonzini /* We always touch the last byte, so just see how big in_iov is. */ 5092a6cdd6dSPaolo Bonzini req->in_len = iov_size(in_iov, in_num); 510ee17e848SFam Zheng req->in = (void *)in_iov[in_num - 1].iov_base 511ee17e848SFam Zheng + in_iov[in_num - 1].iov_len 512ee17e848SFam Zheng - sizeof(struct virtio_blk_inhdr); 513ee17e848SFam Zheng iov_discard_back(in_iov, &in_num, sizeof(struct virtio_blk_inhdr)); 5146e790746SPaolo Bonzini 515*9a6719d5SStefano Garzarella type = virtio_ldl_p(vdev, &req->out.type); 5166e790746SPaolo Bonzini 51795f7142aSPeter Lieven /* VIRTIO_BLK_T_OUT defines the command direction. VIRTIO_BLK_T_BARRIER 518631b22eaSStefan Weil * is an optional flag. Although a guest should not send this flag if 51995f7142aSPeter Lieven * not negotiated we ignored it in the past. So keep ignoring it. */ 52095f7142aSPeter Lieven switch (type & ~(VIRTIO_BLK_T_OUT | VIRTIO_BLK_T_BARRIER)) { 52195f7142aSPeter Lieven case VIRTIO_BLK_T_IN: 52295f7142aSPeter Lieven { 52395f7142aSPeter Lieven bool is_write = type & VIRTIO_BLK_T_OUT; 524*9a6719d5SStefano Garzarella req->sector_num = virtio_ldq_p(vdev, &req->out.sector); 52595f7142aSPeter Lieven 52695f7142aSPeter Lieven if (is_write) { 5275636da76SDongli Zhang qemu_iovec_init_external(&req->qiov, out_iov, out_num); 528a576ceacSStefan Hajnoczi trace_virtio_blk_handle_write(vdev, req, req->sector_num, 52995f7142aSPeter Lieven req->qiov.size / BDRV_SECTOR_SIZE); 53095f7142aSPeter Lieven } else { 53195f7142aSPeter Lieven qemu_iovec_init_external(&req->qiov, in_iov, in_num); 532a576ceacSStefan Hajnoczi trace_virtio_blk_handle_read(vdev, req, req->sector_num, 53395f7142aSPeter Lieven req->qiov.size / BDRV_SECTOR_SIZE); 53495f7142aSPeter Lieven } 53595f7142aSPeter Lieven 536*9a6719d5SStefano Garzarella if (!virtio_blk_sect_range_ok(s, req->sector_num, req->qiov.size)) { 53795f7142aSPeter Lieven virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR); 538*9a6719d5SStefano Garzarella block_acct_invalid(blk_get_stats(s->blk), 53901762e03SAlberto Garcia is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ); 54095f7142aSPeter Lieven virtio_blk_free_request(req); 54120ea686aSGreg Kurz return 0; 54295f7142aSPeter Lieven } 54395f7142aSPeter Lieven 544*9a6719d5SStefano Garzarella block_acct_start(blk_get_stats(s->blk), &req->acct, req->qiov.size, 54595f7142aSPeter Lieven is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ); 54695f7142aSPeter Lieven 54795f7142aSPeter Lieven /* merge would exceed maximum number of requests or IO direction 54895f7142aSPeter Lieven * changes */ 54995f7142aSPeter Lieven if (mrb->num_reqs > 0 && (mrb->num_reqs == VIRTIO_BLK_MAX_MERGE_REQS || 550c99495acSPeter Lieven is_write != mrb->is_write || 551*9a6719d5SStefano Garzarella !s->conf.request_merging)) { 552*9a6719d5SStefano Garzarella virtio_blk_submit_multireq(s->blk, mrb); 55395f7142aSPeter Lieven } 55495f7142aSPeter Lieven 55595f7142aSPeter Lieven assert(mrb->num_reqs < VIRTIO_BLK_MAX_MERGE_REQS); 55695f7142aSPeter Lieven mrb->reqs[mrb->num_reqs++] = req; 55795f7142aSPeter Lieven mrb->is_write = is_write; 55895f7142aSPeter Lieven break; 55995f7142aSPeter Lieven } 56095f7142aSPeter Lieven case VIRTIO_BLK_T_FLUSH: 5616e790746SPaolo Bonzini virtio_blk_handle_flush(req, mrb); 56295f7142aSPeter Lieven break; 56395f7142aSPeter Lieven case VIRTIO_BLK_T_SCSI_CMD: 5646e790746SPaolo Bonzini virtio_blk_handle_scsi(req); 56595f7142aSPeter Lieven break; 56695f7142aSPeter Lieven case VIRTIO_BLK_T_GET_ID: 56795f7142aSPeter Lieven { 5686e790746SPaolo Bonzini /* 5696e790746SPaolo Bonzini * NB: per existing s/n string convention the string is 5706e790746SPaolo Bonzini * terminated by '\0' only when shorter than buffer. 5716e790746SPaolo Bonzini */ 5722a30307fSMarkus Armbruster const char *serial = s->conf.serial ? s->conf.serial : ""; 573a83ceea8SMarc Marí size_t size = MIN(strlen(serial) + 1, 574a83ceea8SMarc Marí MIN(iov_size(in_iov, in_num), 575a83ceea8SMarc Marí VIRTIO_BLK_ID_BYTES)); 576a83ceea8SMarc Marí iov_from_buf(in_iov, in_num, 0, serial, size); 5776e790746SPaolo Bonzini virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); 578671ec3f0SFam Zheng virtio_blk_free_request(req); 57995f7142aSPeter Lieven break; 58095f7142aSPeter Lieven } 58195f7142aSPeter Lieven default: 5826e790746SPaolo Bonzini virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP); 583671ec3f0SFam Zheng virtio_blk_free_request(req); 5846e790746SPaolo Bonzini } 58520ea686aSGreg Kurz return 0; 5866e790746SPaolo Bonzini } 5876e790746SPaolo Bonzini 58807931698SFam Zheng bool virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq) 5896e790746SPaolo Bonzini { 5906e790746SPaolo Bonzini VirtIOBlockReq *req; 59195f7142aSPeter Lieven MultiReqBuffer mrb = {}; 59207931698SFam Zheng bool progress = false; 5936e790746SPaolo Bonzini 5949d456654SPaolo Bonzini aio_context_acquire(blk_get_aio_context(s->blk)); 595fc73548eSStefan Hajnoczi blk_io_plug(s->blk); 596fc73548eSStefan Hajnoczi 5979ef9d402SStefan Hajnoczi do { 5989ef9d402SStefan Hajnoczi virtio_queue_set_notification(vq, 0); 5999ef9d402SStefan Hajnoczi 600edaffd9fSStefan Hajnoczi while ((req = virtio_blk_get_request(s, vq))) { 60107931698SFam Zheng progress = true; 60220ea686aSGreg Kurz if (virtio_blk_handle_request(req, &mrb)) { 60320ea686aSGreg Kurz virtqueue_detach_element(req->vq, &req->elem, 0); 60420ea686aSGreg Kurz virtio_blk_free_request(req); 60520ea686aSGreg Kurz break; 60620ea686aSGreg Kurz } 6076e790746SPaolo Bonzini } 6086e790746SPaolo Bonzini 6099ef9d402SStefan Hajnoczi virtio_queue_set_notification(vq, 1); 6109ef9d402SStefan Hajnoczi } while (!virtio_queue_empty(vq)); 6119ef9d402SStefan Hajnoczi 61295f7142aSPeter Lieven if (mrb.num_reqs) { 61395f7142aSPeter Lieven virtio_blk_submit_multireq(s->blk, &mrb); 61495f7142aSPeter Lieven } 615fc73548eSStefan Hajnoczi 616fc73548eSStefan Hajnoczi blk_io_unplug(s->blk); 6179d456654SPaolo Bonzini aio_context_release(blk_get_aio_context(s->blk)); 61807931698SFam Zheng return progress; 61907931698SFam Zheng } 62007931698SFam Zheng 62107931698SFam Zheng static void virtio_blk_handle_output_do(VirtIOBlock *s, VirtQueue *vq) 62207931698SFam Zheng { 62307931698SFam Zheng virtio_blk_handle_vq(s, vq); 6246e790746SPaolo Bonzini } 6256e790746SPaolo Bonzini 6268a2fad57SMichael S. Tsirkin static void virtio_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq) 6278a2fad57SMichael S. Tsirkin { 6288a2fad57SMichael S. Tsirkin VirtIOBlock *s = (VirtIOBlock *)vdev; 6298a2fad57SMichael S. Tsirkin 6308a2fad57SMichael S. Tsirkin if (s->dataplane) { 6318a2fad57SMichael S. Tsirkin /* Some guests kick before setting VIRTIO_CONFIG_S_DRIVER_OK so start 6328a2fad57SMichael S. Tsirkin * dataplane here instead of waiting for .set_status(). 6338a2fad57SMichael S. Tsirkin */ 6349ffe337cSPaolo Bonzini virtio_device_start_ioeventfd(vdev); 6358a2fad57SMichael S. Tsirkin if (!s->dataplane_disabled) { 6368a2fad57SMichael S. Tsirkin return; 6378a2fad57SMichael S. Tsirkin } 6388a2fad57SMichael S. Tsirkin } 63907931698SFam Zheng virtio_blk_handle_output_do(s, vq); 6408a2fad57SMichael S. Tsirkin } 6418a2fad57SMichael S. Tsirkin 6426e790746SPaolo Bonzini static void virtio_blk_dma_restart_bh(void *opaque) 6436e790746SPaolo Bonzini { 6446e790746SPaolo Bonzini VirtIOBlock *s = opaque; 6456e790746SPaolo Bonzini VirtIOBlockReq *req = s->rq; 64695f7142aSPeter Lieven MultiReqBuffer mrb = {}; 6476e790746SPaolo Bonzini 6486e790746SPaolo Bonzini qemu_bh_delete(s->bh); 6496e790746SPaolo Bonzini s->bh = NULL; 6506e790746SPaolo Bonzini 6516e790746SPaolo Bonzini s->rq = NULL; 6526e790746SPaolo Bonzini 6531919631eSPaolo Bonzini aio_context_acquire(blk_get_aio_context(s->conf.conf.blk)); 6546e790746SPaolo Bonzini while (req) { 6551bdb176aSzhanghailiang VirtIOBlockReq *next = req->next; 65620ea686aSGreg Kurz if (virtio_blk_handle_request(req, &mrb)) { 65720ea686aSGreg Kurz /* Device is now broken and won't do any processing until it gets 65820ea686aSGreg Kurz * reset. Already queued requests will be lost: let's purge them. 65920ea686aSGreg Kurz */ 66020ea686aSGreg Kurz while (req) { 66120ea686aSGreg Kurz next = req->next; 66220ea686aSGreg Kurz virtqueue_detach_element(req->vq, &req->elem, 0); 66320ea686aSGreg Kurz virtio_blk_free_request(req); 66420ea686aSGreg Kurz req = next; 66520ea686aSGreg Kurz } 66620ea686aSGreg Kurz break; 66720ea686aSGreg Kurz } 6681bdb176aSzhanghailiang req = next; 6696e790746SPaolo Bonzini } 6706e790746SPaolo Bonzini 67195f7142aSPeter Lieven if (mrb.num_reqs) { 67295f7142aSPeter Lieven virtio_blk_submit_multireq(s->blk, &mrb); 67395f7142aSPeter Lieven } 6741919631eSPaolo Bonzini aio_context_release(blk_get_aio_context(s->conf.conf.blk)); 6756e790746SPaolo Bonzini } 6766e790746SPaolo Bonzini 6776e790746SPaolo Bonzini static void virtio_blk_dma_restart_cb(void *opaque, int running, 6786e790746SPaolo Bonzini RunState state) 6796e790746SPaolo Bonzini { 6806e790746SPaolo Bonzini VirtIOBlock *s = opaque; 6816e790746SPaolo Bonzini 6826e790746SPaolo Bonzini if (!running) { 6836e790746SPaolo Bonzini return; 6846e790746SPaolo Bonzini } 6856e790746SPaolo Bonzini 6866e790746SPaolo Bonzini if (!s->bh) { 6874be74634SMarkus Armbruster s->bh = aio_bh_new(blk_get_aio_context(s->conf.conf.blk), 6884407c1c5SFam Zheng virtio_blk_dma_restart_bh, s); 6896e790746SPaolo Bonzini qemu_bh_schedule(s->bh); 6906e790746SPaolo Bonzini } 6916e790746SPaolo Bonzini } 6926e790746SPaolo Bonzini 6936e790746SPaolo Bonzini static void virtio_blk_reset(VirtIODevice *vdev) 6946e790746SPaolo Bonzini { 6956e790746SPaolo Bonzini VirtIOBlock *s = VIRTIO_BLK(vdev); 6966e40b3bfSAlexander Yarygin AioContext *ctx; 69726307f6aSFam Zheng VirtIOBlockReq *req; 6986e790746SPaolo Bonzini 6996e40b3bfSAlexander Yarygin ctx = blk_get_aio_context(s->blk); 7006e40b3bfSAlexander Yarygin aio_context_acquire(ctx); 7016e40b3bfSAlexander Yarygin blk_drain(s->blk); 7026e40b3bfSAlexander Yarygin 70326307f6aSFam Zheng /* We drop queued requests after blk_drain() because blk_drain() itself can 70426307f6aSFam Zheng * produce them. */ 70526307f6aSFam Zheng while (s->rq) { 70626307f6aSFam Zheng req = s->rq; 70726307f6aSFam Zheng s->rq = req->next; 70897b93c8aSStefan Hajnoczi virtqueue_detach_element(req->vq, &req->elem, 0); 70926307f6aSFam Zheng virtio_blk_free_request(req); 71026307f6aSFam Zheng } 71126307f6aSFam Zheng 7126e40b3bfSAlexander Yarygin aio_context_release(ctx); 7136e40b3bfSAlexander Yarygin 7149ffe337cSPaolo Bonzini assert(!s->dataplane_started); 7154be74634SMarkus Armbruster blk_set_enable_write_cache(s->blk, s->original_wce); 7166e790746SPaolo Bonzini } 7176e790746SPaolo Bonzini 7186e790746SPaolo Bonzini /* coalesce internal state, copy to pci i/o region 0 7196e790746SPaolo Bonzini */ 7206e790746SPaolo Bonzini static void virtio_blk_update_config(VirtIODevice *vdev, uint8_t *config) 7216e790746SPaolo Bonzini { 7226e790746SPaolo Bonzini VirtIOBlock *s = VIRTIO_BLK(vdev); 7232a30307fSMarkus Armbruster BlockConf *conf = &s->conf.conf; 7246e790746SPaolo Bonzini struct virtio_blk_config blkcfg; 7256e790746SPaolo Bonzini uint64_t capacity; 72617d0bc01SStefan Hajnoczi int64_t length; 727f7516731SMarkus Armbruster int blk_size = conf->logical_block_size; 7286e790746SPaolo Bonzini 7294be74634SMarkus Armbruster blk_get_geometry(s->blk, &capacity); 7306e790746SPaolo Bonzini memset(&blkcfg, 0, sizeof(blkcfg)); 731783d1897SRusty Russell virtio_stq_p(vdev, &blkcfg.capacity, capacity); 732783d1897SRusty Russell virtio_stl_p(vdev, &blkcfg.seg_max, 128 - 2); 733907eb3e5SMichael S. Tsirkin virtio_stw_p(vdev, &blkcfg.geometry.cylinders, conf->cyls); 734783d1897SRusty Russell virtio_stl_p(vdev, &blkcfg.blk_size, blk_size); 735f7516731SMarkus Armbruster virtio_stw_p(vdev, &blkcfg.min_io_size, conf->min_io_size / blk_size); 736f7516731SMarkus Armbruster virtio_stw_p(vdev, &blkcfg.opt_io_size, conf->opt_io_size / blk_size); 737907eb3e5SMichael S. Tsirkin blkcfg.geometry.heads = conf->heads; 7386e790746SPaolo Bonzini /* 7396e790746SPaolo Bonzini * We must ensure that the block device capacity is a multiple of 740e03ba136SPeter Maydell * the logical block size. If that is not the case, let's use 7416e790746SPaolo Bonzini * sector_mask to adopt the geometry to have a correct picture. 7426e790746SPaolo Bonzini * For those devices where the capacity is ok for the given geometry 743e03ba136SPeter Maydell * we don't touch the sector value of the geometry, since some devices 7446e790746SPaolo Bonzini * (like s390 dasd) need a specific value. Here the capacity is already 7456e790746SPaolo Bonzini * cyls*heads*secs*blk_size and the sector value is not block size 7466e790746SPaolo Bonzini * divided by 512 - instead it is the amount of blk_size blocks 7476e790746SPaolo Bonzini * per track (cylinder). 7486e790746SPaolo Bonzini */ 74917d0bc01SStefan Hajnoczi length = blk_getlength(s->blk); 75017d0bc01SStefan Hajnoczi if (length > 0 && length / conf->heads / conf->secs % blk_size) { 751907eb3e5SMichael S. Tsirkin blkcfg.geometry.sectors = conf->secs & ~s->sector_mask; 7526e790746SPaolo Bonzini } else { 753907eb3e5SMichael S. Tsirkin blkcfg.geometry.sectors = conf->secs; 7546e790746SPaolo Bonzini } 7556e790746SPaolo Bonzini blkcfg.size_max = 0; 756f7516731SMarkus Armbruster blkcfg.physical_block_exp = get_physical_block_exp(conf); 7576e790746SPaolo Bonzini blkcfg.alignment_offset = 0; 7584be74634SMarkus Armbruster blkcfg.wce = blk_enable_write_cache(s->blk); 7592f270590SStefan Hajnoczi virtio_stw_p(vdev, &blkcfg.num_queues, s->conf.num_queues); 7606e790746SPaolo Bonzini memcpy(config, &blkcfg, sizeof(struct virtio_blk_config)); 7616e790746SPaolo Bonzini } 7626e790746SPaolo Bonzini 7636e790746SPaolo Bonzini static void virtio_blk_set_config(VirtIODevice *vdev, const uint8_t *config) 7646e790746SPaolo Bonzini { 7656e790746SPaolo Bonzini VirtIOBlock *s = VIRTIO_BLK(vdev); 7666e790746SPaolo Bonzini struct virtio_blk_config blkcfg; 7676e790746SPaolo Bonzini 7686e790746SPaolo Bonzini memcpy(&blkcfg, config, sizeof(blkcfg)); 7696d7e73d6SFam Zheng 7704be74634SMarkus Armbruster aio_context_acquire(blk_get_aio_context(s->blk)); 7714be74634SMarkus Armbruster blk_set_enable_write_cache(s->blk, blkcfg.wce != 0); 7724be74634SMarkus Armbruster aio_context_release(blk_get_aio_context(s->blk)); 7736e790746SPaolo Bonzini } 7746e790746SPaolo Bonzini 7759d5b731dSJason Wang static uint64_t virtio_blk_get_features(VirtIODevice *vdev, uint64_t features, 7769d5b731dSJason Wang Error **errp) 7776e790746SPaolo Bonzini { 7786e790746SPaolo Bonzini VirtIOBlock *s = VIRTIO_BLK(vdev); 7796e790746SPaolo Bonzini 7800cd09c3aSCornelia Huck virtio_add_feature(&features, VIRTIO_BLK_F_SEG_MAX); 7810cd09c3aSCornelia Huck virtio_add_feature(&features, VIRTIO_BLK_F_GEOMETRY); 7820cd09c3aSCornelia Huck virtio_add_feature(&features, VIRTIO_BLK_F_TOPOLOGY); 7830cd09c3aSCornelia Huck virtio_add_feature(&features, VIRTIO_BLK_F_BLK_SIZE); 78495129d6fSCornelia Huck if (virtio_has_feature(features, VIRTIO_F_VERSION_1)) { 785efb8206cSJason Wang if (s->conf.scsi) { 786efb8206cSJason Wang error_setg(errp, "Please set scsi=off for virtio-blk devices in order to use virtio 1.0"); 787efb8206cSJason Wang return 0; 788efb8206cSJason Wang } 789efb8206cSJason Wang } else { 790c9b11f97SJason Wang virtio_clear_feature(&features, VIRTIO_F_ANY_LAYOUT); 791efb8206cSJason Wang virtio_add_feature(&features, VIRTIO_BLK_F_SCSI); 792efb8206cSJason Wang } 7936e790746SPaolo Bonzini 7942a30307fSMarkus Armbruster if (s->conf.config_wce) { 7950cd09c3aSCornelia Huck virtio_add_feature(&features, VIRTIO_BLK_F_CONFIG_WCE); 7966e790746SPaolo Bonzini } 7974be74634SMarkus Armbruster if (blk_enable_write_cache(s->blk)) { 7980cd09c3aSCornelia Huck virtio_add_feature(&features, VIRTIO_BLK_F_WCE); 7994be74634SMarkus Armbruster } 8004be74634SMarkus Armbruster if (blk_is_read_only(s->blk)) { 8010cd09c3aSCornelia Huck virtio_add_feature(&features, VIRTIO_BLK_F_RO); 8024be74634SMarkus Armbruster } 8032f270590SStefan Hajnoczi if (s->conf.num_queues > 1) { 8042f270590SStefan Hajnoczi virtio_add_feature(&features, VIRTIO_BLK_F_MQ); 8052f270590SStefan Hajnoczi } 8066e790746SPaolo Bonzini 8076e790746SPaolo Bonzini return features; 8086e790746SPaolo Bonzini } 8096e790746SPaolo Bonzini 8106e790746SPaolo Bonzini static void virtio_blk_set_status(VirtIODevice *vdev, uint8_t status) 8116e790746SPaolo Bonzini { 8126e790746SPaolo Bonzini VirtIOBlock *s = VIRTIO_BLK(vdev); 8136e790746SPaolo Bonzini 8149ffe337cSPaolo Bonzini if (!(status & (VIRTIO_CONFIG_S_DRIVER | VIRTIO_CONFIG_S_DRIVER_OK))) { 8159ffe337cSPaolo Bonzini assert(!s->dataplane_started); 8166e790746SPaolo Bonzini } 8176e790746SPaolo Bonzini 8186e790746SPaolo Bonzini if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) { 8196e790746SPaolo Bonzini return; 8206e790746SPaolo Bonzini } 8216e790746SPaolo Bonzini 822ef5bc962SPaolo Bonzini /* A guest that supports VIRTIO_BLK_F_CONFIG_WCE must be able to send 823ef5bc962SPaolo Bonzini * cache flushes. Thus, the "auto writethrough" behavior is never 824ef5bc962SPaolo Bonzini * necessary for guests that support the VIRTIO_BLK_F_CONFIG_WCE feature. 825ef5bc962SPaolo Bonzini * Leaving it enabled would break the following sequence: 826ef5bc962SPaolo Bonzini * 827ef5bc962SPaolo Bonzini * Guest started with "-drive cache=writethrough" 828ef5bc962SPaolo Bonzini * Guest sets status to 0 829ef5bc962SPaolo Bonzini * Guest sets DRIVER bit in status field 830ef5bc962SPaolo Bonzini * Guest reads host features (WCE=0, CONFIG_WCE=1) 831ef5bc962SPaolo Bonzini * Guest writes guest features (WCE=0, CONFIG_WCE=1) 832ef5bc962SPaolo Bonzini * Guest writes 1 to the WCE configuration field (writeback mode) 833ef5bc962SPaolo Bonzini * Guest sets DRIVER_OK bit in status field 834ef5bc962SPaolo Bonzini * 8354be74634SMarkus Armbruster * s->blk would erroneously be placed in writethrough mode. 836ef5bc962SPaolo Bonzini */ 83795129d6fSCornelia Huck if (!virtio_vdev_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE)) { 8384be74634SMarkus Armbruster aio_context_acquire(blk_get_aio_context(s->blk)); 8394be74634SMarkus Armbruster blk_set_enable_write_cache(s->blk, 84095129d6fSCornelia Huck virtio_vdev_has_feature(vdev, 84195129d6fSCornelia Huck VIRTIO_BLK_F_WCE)); 8424be74634SMarkus Armbruster aio_context_release(blk_get_aio_context(s->blk)); 8436e790746SPaolo Bonzini } 844ef5bc962SPaolo Bonzini } 8456e790746SPaolo Bonzini 846b2b295a7SGreg Kurz static void virtio_blk_save_device(VirtIODevice *vdev, QEMUFile *f) 847b2b295a7SGreg Kurz { 848b2b295a7SGreg Kurz VirtIOBlock *s = VIRTIO_BLK(vdev); 849b2b295a7SGreg Kurz VirtIOBlockReq *req = s->rq; 8506e790746SPaolo Bonzini 8516e790746SPaolo Bonzini while (req) { 8526e790746SPaolo Bonzini qemu_put_sbyte(f, 1); 85330d8bf6dSStefan Hajnoczi 85430d8bf6dSStefan Hajnoczi if (s->conf.num_queues > 1) { 85530d8bf6dSStefan Hajnoczi qemu_put_be32(f, virtio_get_queue_index(req->vq)); 85630d8bf6dSStefan Hajnoczi } 85730d8bf6dSStefan Hajnoczi 858ab281c17SPaolo Bonzini qemu_put_virtqueue_element(f, &req->elem); 8596e790746SPaolo Bonzini req = req->next; 8606e790746SPaolo Bonzini } 8616e790746SPaolo Bonzini qemu_put_sbyte(f, 0); 8626e790746SPaolo Bonzini } 8636e790746SPaolo Bonzini 864b2b295a7SGreg Kurz static int virtio_blk_load_device(VirtIODevice *vdev, QEMUFile *f, 865b2b295a7SGreg Kurz int version_id) 866b2b295a7SGreg Kurz { 867b2b295a7SGreg Kurz VirtIOBlock *s = VIRTIO_BLK(vdev); 868b2b295a7SGreg Kurz 8696e790746SPaolo Bonzini while (qemu_get_sbyte(f)) { 87030d8bf6dSStefan Hajnoczi unsigned nvqs = s->conf.num_queues; 87130d8bf6dSStefan Hajnoczi unsigned vq_idx = 0; 872ab281c17SPaolo Bonzini VirtIOBlockReq *req; 87330d8bf6dSStefan Hajnoczi 87430d8bf6dSStefan Hajnoczi if (nvqs > 1) { 87530d8bf6dSStefan Hajnoczi vq_idx = qemu_get_be32(f); 87630d8bf6dSStefan Hajnoczi 87730d8bf6dSStefan Hajnoczi if (vq_idx >= nvqs) { 87830d8bf6dSStefan Hajnoczi error_report("Invalid virtqueue index in request list: %#x", 87930d8bf6dSStefan Hajnoczi vq_idx); 88030d8bf6dSStefan Hajnoczi return -EINVAL; 88130d8bf6dSStefan Hajnoczi } 88230d8bf6dSStefan Hajnoczi } 88330d8bf6dSStefan Hajnoczi 8848607f5c3SJason Wang req = qemu_get_virtqueue_element(vdev, f, sizeof(VirtIOBlockReq)); 88530d8bf6dSStefan Hajnoczi virtio_blk_init_request(s, virtio_get_queue(vdev, vq_idx), req); 8866e790746SPaolo Bonzini req->next = s->rq; 8876e790746SPaolo Bonzini s->rq = req; 8886e790746SPaolo Bonzini } 8896e790746SPaolo Bonzini 8906e790746SPaolo Bonzini return 0; 8916e790746SPaolo Bonzini } 8926e790746SPaolo Bonzini 8936e790746SPaolo Bonzini static void virtio_blk_resize(void *opaque) 8946e790746SPaolo Bonzini { 8956e790746SPaolo Bonzini VirtIODevice *vdev = VIRTIO_DEVICE(opaque); 8966e790746SPaolo Bonzini 8976e790746SPaolo Bonzini virtio_notify_config(vdev); 8986e790746SPaolo Bonzini } 8996e790746SPaolo Bonzini 9006e790746SPaolo Bonzini static const BlockDevOps virtio_block_ops = { 9016e790746SPaolo Bonzini .resize_cb = virtio_blk_resize, 9026e790746SPaolo Bonzini }; 9036e790746SPaolo Bonzini 90475884afdSAndreas Färber static void virtio_blk_device_realize(DeviceState *dev, Error **errp) 9056e790746SPaolo Bonzini { 90675884afdSAndreas Färber VirtIODevice *vdev = VIRTIO_DEVICE(dev); 907179b417eSAndreas Färber VirtIOBlock *s = VIRTIO_BLK(dev); 9082a30307fSMarkus Armbruster VirtIOBlkConf *conf = &s->conf; 9093ffeeef7SAndreas Färber Error *err = NULL; 9102f270590SStefan Hajnoczi unsigned i; 9116e790746SPaolo Bonzini 9124be74634SMarkus Armbruster if (!conf->conf.blk) { 91375884afdSAndreas Färber error_setg(errp, "drive property not set"); 91475884afdSAndreas Färber return; 9156e790746SPaolo Bonzini } 9164be74634SMarkus Armbruster if (!blk_is_inserted(conf->conf.blk)) { 91775884afdSAndreas Färber error_setg(errp, "Device needs media, but drive is empty"); 91875884afdSAndreas Färber return; 9196e790746SPaolo Bonzini } 9202f270590SStefan Hajnoczi if (!conf->num_queues) { 9212f270590SStefan Hajnoczi error_setg(errp, "num-queues property must be larger than 0"); 9222f270590SStefan Hajnoczi return; 9232f270590SStefan Hajnoczi } 9246040aeddSMark Kanda if (!is_power_of_2(conf->queue_size) || 9256040aeddSMark Kanda conf->queue_size > VIRTQUEUE_MAX_SIZE) { 9266040aeddSMark Kanda error_setg(errp, "invalid queue-size property (%" PRIu16 "), " 9276040aeddSMark Kanda "must be a power of 2 (max %d)", 9286040aeddSMark Kanda conf->queue_size, VIRTQUEUE_MAX_SIZE); 9296040aeddSMark Kanda return; 9306040aeddSMark Kanda } 9316e790746SPaolo Bonzini 932ceff3e1fSMao Zhongyi if (!blkconf_apply_backend_options(&conf->conf, 933a17c17a2SKevin Wolf blk_is_read_only(conf->conf.blk), true, 934ceff3e1fSMao Zhongyi errp)) { 935a17c17a2SKevin Wolf return; 936a17c17a2SKevin Wolf } 9374be74634SMarkus Armbruster s->original_wce = blk_enable_write_cache(conf->conf.blk); 938ceff3e1fSMao Zhongyi if (!blkconf_geometry(&conf->conf, NULL, 65535, 255, 255, errp)) { 93975884afdSAndreas Färber return; 9406e790746SPaolo Bonzini } 941ceff3e1fSMao Zhongyi 9420eb28a42SEkaterina Tumanova blkconf_blocksizes(&conf->conf); 9436e790746SPaolo Bonzini 9440a75b60cSMark Kanda if (conf->conf.logical_block_size > 9450a75b60cSMark Kanda conf->conf.physical_block_size) { 9460a75b60cSMark Kanda error_setg(errp, 9470a75b60cSMark Kanda "logical_block_size > physical_block_size not supported"); 9480a75b60cSMark Kanda return; 9490a75b60cSMark Kanda } 9500a75b60cSMark Kanda 9516e790746SPaolo Bonzini virtio_init(vdev, "virtio-blk", VIRTIO_ID_BLOCK, 9526e790746SPaolo Bonzini sizeof(struct virtio_blk_config)); 9536e790746SPaolo Bonzini 9544be74634SMarkus Armbruster s->blk = conf->conf.blk; 9556e790746SPaolo Bonzini s->rq = NULL; 9562a30307fSMarkus Armbruster s->sector_mask = (s->conf.conf.logical_block_size / BDRV_SECTOR_SIZE) - 1; 9576e790746SPaolo Bonzini 9582f270590SStefan Hajnoczi for (i = 0; i < conf->num_queues; i++) { 9596040aeddSMark Kanda virtio_add_queue(vdev, conf->queue_size, virtio_blk_handle_output); 9602f270590SStefan Hajnoczi } 9612a30307fSMarkus Armbruster virtio_blk_data_plane_create(vdev, conf, &s->dataplane, &err); 9623ffeeef7SAndreas Färber if (err != NULL) { 96375884afdSAndreas Färber error_propagate(errp, err); 9646a1a8cc7SKONRAD Frederic virtio_cleanup(vdev); 96575884afdSAndreas Färber return; 9666e790746SPaolo Bonzini } 9676e790746SPaolo Bonzini 9686e790746SPaolo Bonzini s->change = qemu_add_vm_change_state_handler(virtio_blk_dma_restart_cb, s); 9694be74634SMarkus Armbruster blk_set_dev_ops(s->blk, &virtio_block_ops, s); 9704be74634SMarkus Armbruster blk_set_guest_block_size(s->blk, s->conf.conf.logical_block_size); 9716e790746SPaolo Bonzini 9724be74634SMarkus Armbruster blk_iostatus_enable(s->blk); 9736e790746SPaolo Bonzini } 9746e790746SPaolo Bonzini 975306ec6c3SAndreas Färber static void virtio_blk_device_unrealize(DeviceState *dev, Error **errp) 9766e790746SPaolo Bonzini { 977306ec6c3SAndreas Färber VirtIODevice *vdev = VIRTIO_DEVICE(dev); 978306ec6c3SAndreas Färber VirtIOBlock *s = VIRTIO_BLK(dev); 979306ec6c3SAndreas Färber 9806e790746SPaolo Bonzini virtio_blk_data_plane_destroy(s->dataplane); 9816e790746SPaolo Bonzini s->dataplane = NULL; 9826e790746SPaolo Bonzini qemu_del_vm_change_state_handler(s->change); 9834be74634SMarkus Armbruster blockdev_mark_auto_del(s->blk); 9846a1a8cc7SKONRAD Frederic virtio_cleanup(vdev); 9856e790746SPaolo Bonzini } 9866e790746SPaolo Bonzini 987467b3f33SStefan Hajnoczi static void virtio_blk_instance_init(Object *obj) 988467b3f33SStefan Hajnoczi { 989467b3f33SStefan Hajnoczi VirtIOBlock *s = VIRTIO_BLK(obj); 990467b3f33SStefan Hajnoczi 9912a30307fSMarkus Armbruster device_add_bootindex_property(obj, &s->conf.conf.bootindex, 9923342ec32SGonglei "bootindex", "/disk@0,0", 9933342ec32SGonglei DEVICE(obj), NULL); 994467b3f33SStefan Hajnoczi } 995467b3f33SStefan Hajnoczi 996977a117fSHalil Pasic static const VMStateDescription vmstate_virtio_blk = { 997977a117fSHalil Pasic .name = "virtio-blk", 998977a117fSHalil Pasic .minimum_version_id = 2, 999977a117fSHalil Pasic .version_id = 2, 1000977a117fSHalil Pasic .fields = (VMStateField[]) { 1001977a117fSHalil Pasic VMSTATE_VIRTIO_DEVICE, 1002977a117fSHalil Pasic VMSTATE_END_OF_LIST() 1003977a117fSHalil Pasic }, 1004977a117fSHalil Pasic }; 1005bbded32cSDr. David Alan Gilbert 10066e790746SPaolo Bonzini static Property virtio_blk_properties[] = { 10072a30307fSMarkus Armbruster DEFINE_BLOCK_PROPERTIES(VirtIOBlock, conf.conf), 10088c398252SKevin Wolf DEFINE_BLOCK_ERROR_PROPERTIES(VirtIOBlock, conf.conf), 10092a30307fSMarkus Armbruster DEFINE_BLOCK_CHS_PROPERTIES(VirtIOBlock, conf.conf), 10102a30307fSMarkus Armbruster DEFINE_PROP_STRING("serial", VirtIOBlock, conf.serial), 10112a30307fSMarkus Armbruster DEFINE_PROP_BIT("config-wce", VirtIOBlock, conf.config_wce, 0, true), 101232a877e4SStefan Hajnoczi #ifdef __linux__ 1013ed65fd1aSCornelia Huck DEFINE_PROP_BIT("scsi", VirtIOBlock, conf.scsi, 0, false), 101432a877e4SStefan Hajnoczi #endif 1015c99495acSPeter Lieven DEFINE_PROP_BIT("request-merging", VirtIOBlock, conf.request_merging, 0, 1016c99495acSPeter Lieven true), 10172f270590SStefan Hajnoczi DEFINE_PROP_UINT16("num-queues", VirtIOBlock, conf.num_queues, 1), 10186040aeddSMark Kanda DEFINE_PROP_UINT16("queue-size", VirtIOBlock, conf.queue_size, 128), 1019d679ac09SFam Zheng DEFINE_PROP_LINK("iothread", VirtIOBlock, conf.iothread, TYPE_IOTHREAD, 1020d679ac09SFam Zheng IOThread *), 10216e790746SPaolo Bonzini DEFINE_PROP_END_OF_LIST(), 10226e790746SPaolo Bonzini }; 10236e790746SPaolo Bonzini 10246e790746SPaolo Bonzini static void virtio_blk_class_init(ObjectClass *klass, void *data) 10256e790746SPaolo Bonzini { 10266e790746SPaolo Bonzini DeviceClass *dc = DEVICE_CLASS(klass); 10276e790746SPaolo Bonzini VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 102875884afdSAndreas Färber 10296e790746SPaolo Bonzini dc->props = virtio_blk_properties; 1030bbded32cSDr. David Alan Gilbert dc->vmsd = &vmstate_virtio_blk; 1031125ee0edSMarcel Apfelbaum set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); 103275884afdSAndreas Färber vdc->realize = virtio_blk_device_realize; 1033306ec6c3SAndreas Färber vdc->unrealize = virtio_blk_device_unrealize; 10346e790746SPaolo Bonzini vdc->get_config = virtio_blk_update_config; 10356e790746SPaolo Bonzini vdc->set_config = virtio_blk_set_config; 10366e790746SPaolo Bonzini vdc->get_features = virtio_blk_get_features; 10376e790746SPaolo Bonzini vdc->set_status = virtio_blk_set_status; 10386e790746SPaolo Bonzini vdc->reset = virtio_blk_reset; 1039b2b295a7SGreg Kurz vdc->save = virtio_blk_save_device; 1040b2b295a7SGreg Kurz vdc->load = virtio_blk_load_device; 10419ffe337cSPaolo Bonzini vdc->start_ioeventfd = virtio_blk_data_plane_start; 10429ffe337cSPaolo Bonzini vdc->stop_ioeventfd = virtio_blk_data_plane_stop; 10436e790746SPaolo Bonzini } 10446e790746SPaolo Bonzini 1045b5c7ceafSChanglong Xie static const TypeInfo virtio_blk_info = { 10466e790746SPaolo Bonzini .name = TYPE_VIRTIO_BLK, 10476e790746SPaolo Bonzini .parent = TYPE_VIRTIO_DEVICE, 10486e790746SPaolo Bonzini .instance_size = sizeof(VirtIOBlock), 1049467b3f33SStefan Hajnoczi .instance_init = virtio_blk_instance_init, 10506e790746SPaolo Bonzini .class_init = virtio_blk_class_init, 10516e790746SPaolo Bonzini }; 10526e790746SPaolo Bonzini 10536e790746SPaolo Bonzini static void virtio_register_types(void) 10546e790746SPaolo Bonzini { 1055b5c7ceafSChanglong Xie type_register_static(&virtio_blk_info); 10566e790746SPaolo Bonzini } 10576e790746SPaolo Bonzini 10586e790746SPaolo Bonzini type_init(virtio_register_types) 1059